Mitel IP Phones & DHCP Options

[Technician98]

I was hoping someone could shed some light on how the phones I have recently installed onsite are actually working!

They are Mitel 5330e IP Phones.

So a customer of ours recently moved office, their old site had a Cisco router with DHCP options that told the phones the IP address of the virtual MiVB in our data centre.

On their new site we had installed a Zyxel router which does not have the ability to add DHCP options, however when we connected the phones they booted straight up with no issues except for two phones which displayed `Option 129 Missing.'

I checked one of the phones that was working to see if it had any static values added but there were none at all.

From my understanding when a phone is rebooted it loses any config other than config that has been set manually on the phone? I had a theory that the phones that were working remembered their DHCP options and the two phones that didn't work were spare phones that weren't in use so did not remember, however my previous sentence disproves that so I would like some helping understanding how the phones are working.

Many thanks.

 

[sarond]

Sounds like they have been placed in teleworker mode.

While the phone is booting hold down the 7 key to configure teleworker settings. This will allow the phone to use a standard DHCP server and you only need to enter the IP address of the MBG/MiVB.

 

[Technician98]

That is possible as I do not believe I checked if the MiVB address had been entered within the phones teleworker settings. They are definitely not connected to an MBG.

However, I would be surprised to find teleworker settings configured on the phone as there would have been no need for this at their previous site as the Cisco router was providing the phones with DHCP options. It remains a mystery how the phones knew the IP of the MiVB when connected at the customers new site!

 

[Billz66]

I agree with sarond
hold down arrows , let go of one of them and enter 234
press # until phone mode
then *then # for protocol
then * for configure TW
then # for new

then * for ipv4

if you have an ip address assigned then the phone is in what we refer to as teleworker mode
- just means that it wont expect option 125 and will just get basic data from any DHCP server ( ip sub gateway)
Pabx address is entered as the tw and it uses that for Connection and tftp source

If I never did anything I'd never done before , I'd never do anything.....